Estimate your baby's due date and see how far along you are.
Last period 1 Jan 2026
Naegele's rule adds 280 days to the last period.
Due ~8 Oct 2026
12 weeks along
The first trimester ends at 14 weeks.
Trimester 2 soon
How the figures above are worked out — the rules, rates and reasoning behind every line.
The estimated due date (EDD) is calculated from the first day of your last menstrual period using Naegele's rule — the standard clinical method.
It also tells you your current gestational age in weeks and which trimester you're in.
Naegele's rule adds 280 days (40 weeks) to the first day of your last period, assuming a regular 28-day cycle with ovulation around day 14.
Only about 5% of babies are born on their exact due date. An ultrasound dating scan gives a more precise estimate, especially with irregular cycles.
It's a solid estimate based on a 28-day cycle. Your doctor's dating scan is more accurate, particularly if your cycle is irregular or you're unsure of your last period.
Pregnancy is counted from the first day of your last period, so you're already considered ~2 weeks pregnant at conception. The calculator shows your current week.
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